# Field notes — week of September 21, 2026 > Source: > Published: 2026-09-28 00:00:00+00:00 # Field notes — week of September 21, 2026 What changed in AI-support and AI-localization tooling this week. Every item was checked against its source before it entered this list. - **Anthropic** -[introduced Claude Opus 5.5](https://www.anthropic.com/news/claude-opus-5-5) (Sept 22), a new flagship model that Anthropic says performs at the level of Claude Fable 5.1 on most work while costing 40% less to run than Opus 5 at default settings. - **OpenAI** - released[GPT-6 Sol and GPT-6 Luna](https://developers.openai.com/api/docs/changelog) (Sept 22), two new reasoning models available through the Responses and Chat Completions APIs; pricing is $2 / $0.20 / $10 per million input / cached-input / output tokens for Sol and $0.10 / $0.01 / $0.50 for Luna. - **Sierra** - published[Your agent, laid bare](https://sierra.ai/blog/your-agent-laid-bare-and-why-it-matters) (Sept 22), arguing for agent platforms that expose their logic and keep a complete, exportable record of agent actions rather than acting as an opaque black box. - **Decagon** - is[expanding into the Benelux region](https://decagon.ai/blog/growing-in-benelux) (Sept 21), building a local team across Belgium, the Netherlands and Luxembourg; the post cites Rituals, an Amsterdam beauty brand, deploying Decagon's "Ray" concierge across 19 countries and 15 languages within two months, handling up to 9,000 customer cases a day at peak. - **Intercom** - two changes this week:[custom metrics in reporting](https://www.intercom.com/changes/en/158136-build-the-metric-you-need-across-your-full-history) (Sept 23) let teams combine built-in measurements and filters into their own metrics;[call termination reasons](https://www.intercom.com/changes/en/157743-see-why-an-outbound-call-didn-t-connect) (Sept 21) now show why an outbound call failed to connect. - **DeepL** -[is now available inside Microsoft Copilot, ChatGPT and Claude](https://www.deepl.com/en/blog/deepl-available-in-microsoft-copilot-chatgpt-claude-mcp) (Sept 22) through a Model Context Protocol integration that translates text and documents and applies a company's glossary and style rules without leaving the assistant.